Ya.. I know that, and it is something that is always in the back of my head, but consider... I normally run my tire psi, at 30-35 psi... is another 5-10 psi really going to cause a problem? I hope not... and have had no issues yet.

 

well I'd hope the extra pressure doesn't cause any problem, and most of the time it won't. but I throw it out there anyways.
I had an F250 truck (yep, ford) with the tires inflated to max sidewall rating (which was also the doorjamb rating) and had to carry slightly more than what the truck was rated for (had about 2500 lbs in the bed) and had already driven 150 miles on the freeway to where I picked up the materials and left there overloaded, albeit only slightly. 25 miles away from my pick-up point, I blew a tire. Actually, I felt the truck shift and pulled over to the side of the road and found the sidewalls on the right rear tire bubbling out. While I was there looking at the tire, one of them bubbles decided to pop and the truck dropped to the rim.
I tell you these things because the tire wasn't over-inflated by any means and I was only overloaded by 500 pounds. Something you would think would be covered by the safety margins that everyone wants to put in their product so there aren't problems. Heck, toyota pickup trucks aren't rated for but 1/2 ton (unless it received special packages), but often carry twice that with no problem.

 

If you're referring to the 38psi I was toying with, I wouldn't consider that severaly overinflated. It's only 3psi over what I normaly run in the rear and have never, ever had a problem. I am surprised it made the difference...partial diff, anyway....in the mileage. I say that because I knocked the press. down this morn' to 35psi all around again and saw only about 19. I don't know....this is the first stage of the personal expiramento and too many variables to really say that's even accurate. I'll keep updating, if anyone is interested.

 

In what way does having more gas in the tank cause you to get better mileage? I don't see any physical reason for this to happen.

Maybe since you fill up everyday it keeps it in your mind to drive conservatively?

 

Was just thinking the same thing myself. Workin it through the ol noggin to see if I couldn't think of a reason why that'd be true. If anything keeping your vehicle gassed up all the way would contribute to worse gas mileage because of the added weight. Dunno... I think you nailed it with the driving conservatively comment.

 

another thing to consider is that when you fill up your tank, 'full' is never really the same level. like the tank that I overfilled (and spilled about a half gallon), I got well over 23 mpgs. but that is because I had the filler neck of the tank completely full, along with no air voids in the tank itself. the tank before it, I got about 16, because of what it took to fill it. driving out whole tanks seems to alleviate some of this problem though.

 

Go to sleep Clint. Only one Clint is allowed online at a time.

 

you go to sleep, Clint. I was online first!

and hey,

 

 

Hah! And I aint even gone to sleep yet!

 

Do you top off the tank even after the nozzle clicks off?

Fink

 

Yeah, that's how I try to make sure I'm filling up the same amount every time. I stop at the first click.

 

i think it has to do with the amount of pressure that in the tank (being full). My 1989 Toyota Camry's mileage was always best on the first quarter of a tank.

 

Okay, guys....I understand all the reasoning why keeping the tank topped off shouldn't really contribute to better mileage.....ie, more weight, yadda, yadda. That's what I've always thought, too. But, months ago my wife heard from a couple of people and read on the internet about how a lower tank contributes more to fuel evaporation. She told me about this and I was VERY skeptical.

So, I watched her run through this little practice over this time and tried to remain objective. But, continually getting 17-18mpgs in my '86, I figured I'd give it a try. My driving habits are good....conservative; I don't speed as a rule, I fill up before the tanks reaches below half (keeps the fuel pump cooler), and always, always stop when the gas filler clicks off. Going over can ruin the evap can. Not only that, it throws off accurate mileage assessments. But, the 20+mpgs I got the other day was partial highway, partial inner city, plenty of hills....mild to steep, and a considerable amount of weight in the back part of that time.

Anyway, since I screwed around with tire press. I can't really be accurate on how much either factor improved mileage...(tire press/refilling) So, I will have to continue to expirament with it before I can have anything truely concrete to go on. I guess I just got excited and blew my wad....maybe a little prematurely. Plus, I just had to call you all........SUCKAS!!!!! It's just so much fun to say....

 

The first click isn't reliable. I've had it click then pump in 4 more gallons.

I read a long time ago in Consumer Reports that they considered a tank full after the 3rd click so that's what I've always done.

But as always with everything else on this forum as well, YMMV.

 

You just have bad clickers. You need to upgrade to clappers.

 

how about sock'em boppers?




"They're more fun than a pillow fight!"





just ask Allan and his gay lover(s).

 

I'd ask if I was interested.....

I thought to also mention when I fill up I do so slowly. Seems to help avoid the clicker clicking too soon.

 

Okay....last tank was 19.5mpg's and the one before was right at 20. I'm still seeing improvement even at 35psi.

 

your just mad clint or should i say big turkinwheels that i didnt ask for you to join! ha ha